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Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all.  To have an event posted here please follow this link:  Event Policy Submission & Guidelines.

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April 2018

Three Creeks Half Marathon

April 22
Cherry Creek State Park, 4201 S Parker Rd
Aurora, CO 80014
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Denver Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a USA Track & Field certified half marathon course that is flat, fast and scenic! Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total combined elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek on a mix of road,…

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May 2018

Barkin’ Dog Duathlon

May 6
Cherry Creek State Park, 4201 S Parker Rd
Aurora, CO 80014
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Denver The Barkin' Dog Duathlon celebrates 20 years as the kickoff race for the summer multisport season! The BarkinÕ Dog is Colorado's largest duathlon, and consistently one of the largest duathlons in the Western United States. The race spent it's first seven years in the small town of Keenesburg, just north and east of Denver, but we outgrew that location and made the move to Cherry Creek State Park in 2006. This race attracts some of the top pro's in…

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June 2018

Mt Evans Ascent

June 9
Mt Evans Idaho Springs, CO United States + Google Map

Idaho Springs   Although the air will be noticeably thin at the starting line, Echo Lake's 10,600 feet of elevation is just the beginning. The climb totals nearly 4,000 vertical feet - much of it above treeline - as you make your way 14.5 miles to the finish line located at the summit of one of the most recognizable peaks on Denver's mountain skyline - 14,264 foot Mt. Evans.   Be inspired!!! Join us on June 9, 2018 for another…

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July 2018

Evergreen Sprint Triathlon

July 22

Evergreen   Experience the "WOW Factor" on this beautiful foothills course!!! Nothing beats this cool lake swim, spectacular road bike ride, and scenic dirt road & trail run - all just 20 minutes from Denver Evergreen Lake had not seen a triathlon since the early 90's when the Evergreen High Country Triathlon challenged athletes from around the country. We revived the tradition in 2012, and the course received rave reviews. Demand for the fifth edition of the Evergreen Sprint Triathlon…

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September 2018

Littlefoot Triathlon

September 15
Bear Creek Lake Park Lakewood, CO United States + Google Map

Morrison   Enjoy a fun late season tri at beautiful Bear Creek Lake Park in the Lakewood/Morrison area. Set at the base of the foothills, the Littlefoot Triathlon starts off with a 750 meter swim in Soda Lake, with water temps expected to be approximately 70 degrees. Next, a rolling bike 15K bike ride that covers nearly the entire park, offering great views throughout! Finish it up with a scenic 5K run on a bike path that winds through the…

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